Download/install the desktop application, sign in, install the subscription application(s).
https://helpx.adobe.com/creative-cloud/help/download-install-app.html
Creative Cloud for desktop
https://helpx.adobe.com/creative-cloud/help/creative-cloud-desktop.html
Sign out, Sign in | Creative Cloud desktop app
http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
Install, update, or uninstall apps
http://helpx.adobe.com/creative-cloud/help/install-apps.html